Unit 4 Practice Quiz
What is the electron configuration of potassium? 1s^2 2s^2 2p^6 3s^2 3p^6 4s^1 1s^2 2s^2 2p^10 3s^2 3p^3 1s^2 2s^2 2p^2 3s^2 3p^2 4s^1 1s^2 2s^2 3s^2 3p^6 3d^1
1s^2 2s^2 2p^6 3s^2 3p^6 4s^1
How many electrons are in the highest occupied energy level of a neutral strontium atom?
2
How many energy sublevels are in the second principal energy level? 1 2 3 4
2
How many unpaired electrons are in a sulfur atom, which has the atomic number 16? 3 1 2 0
2
What is the maximum number of orbitals in the p sub level? 2 3 4 5
3
What is the wavelength of an electromagnetic wave that travels at 3 x 10^8 m/s and has a frequency of 60 MHz? (1 MHz = 1,000,000 Hz) 60,000,000 Hz/300,000,000 m/s 60 MHz ´ 300,000,000 m/s 300,000,000 m/s / 60,000,000 Hz No answer can be determined from the information given.
300,000,000 m/s / 60,000,000 Hz
Which electron configuration of the 4f energy sublevel is the most stable? 4f^13 4f^14 4f 4f^7
4^14
Which of the following electron configurations of outer sublevels is the most stable? 4d2 5s4 4d3 5s3 4d5 5s1 4d4 5s2
4d5 5s1
What is the next atomic orbital in the series 1s, 2s, 2p, 3s, 3p? 2d 3f 4s 3d
4s
What is the maximum number of d orbitals in a principal energy level? 3 2 1 5
5
What is the number of electrons in the outermost energy level of an oxygen atom? 4 2 6 8
6
What is the number of electrons in the outermost energy level of an oxygen atom? 8 2 6 4
6
What is the maximum number of f orbitals in any single energy level in an atom? 7 1 5 3
7
What is the maximum number of electrons in the second principal energy level? 18 2 8 32
8
What is the approximate frequency of a photon having an energy of (5x10^-24)J (H= 6.6x10^-34) 3 x 10^-57 Hz 1 x 10^-10 Hz 8 x 10^9 Hz 3x10^-58
8 x 10^9 Hz
When an electron moves from a lower to a higher energy level, the electron absorbs a quantum of energy. absorbs a continuously variable amount of energy. always doubles its energy. moves closer to the nucleus.
Absorbs a quantum of energy
frequencies of light emitted by an element
Atomic emission
region of high probability of finding an electron
Atomic orbital
tendency of electrons to enter orbitals of lowest energy first
Aufbau principle
What is the shape of the 3p atomic orbital? sphere two perpendicular dumbbells dumbbell bar
Dumbbell
arrangement of electrons around atomic nucleus
Electron configuration
According to the aufbau principle, electrons enter orbitals of lowest energy first. an orbital may be occupied by only two electrons. electrons enter orbitals of highest energy first. electrons in the same orbital must have opposite spins.
Electrons enter orbitals of lowest energy first
Which variable is directly proportional to frequency? position wavelength velocity energy
Energy
Which variable is directly proportional to frequency? velocity position energy wavelength
Energy
The principal quantum number indicates what property of an electron? speed energy level electron cloud shape position
Energy level
Which scientist developed the quantum mechanical model of the atom? Niels Bohr Erwin Schrodinger Ernest Rutherford Albert Einstein
Erwin Schrodinger
What is the basis for exceptions to the aufbau diagram? Electron configurations are only probable. Electron spins are more important than energy levels in determining electron configuration. Filled and half-filled energy sublevels are more stable than partially-filled energy sublevels. Some elements have unusual atomic orbitals.
Filled and half-filled energy sublevels are more stable than partially-filled energy sublevels.
Stable electron configurations are likely to contain electrons with a clockwise spin. filled energy sublevels. fewer electrons than unstable configurations. unfilled s orbitals
Filled energy sub levels
number of wave cycles passing a point per unit of time
Frequency
Which of the following electromagnetic waves have the highest frequencies? microwaves X-rays ultraviolet light waves gamma rays
Gamma rays
lowest energy level
Ground State
states the impossibility of knowing both velocity and position of a moving particle at the same time
Heisenberg uncertainty principle
As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit remain the same. cannot be determined. decrease. increase.
Increase
Who predicted that all matter can behave as waves as well as particles? Max Planck Albert Einstein Erwin Schrodinger Louis de Broglie
Louis de Broglie
The wavelike properties of electrons are useful in defining photons. determining the velocity and position of a particle. magnifying objects. writing electron configurations.
Magnifying objects
each orbital has at most two electrons
Paul exclusion principle
What are quanta of light called? excitons charms muons photons
Photons
energy needed to move an electron from one energy level to another
Quantum
In an s orbital, the probability of finding an electron a particular distance from the nucleus can best be determined by the direction of the electron with respect to the nucleus. boundary of the electron cloud. quantum mechanical model. deBroglie equation.
Quantum mechanical model
What types of atomic orbitals are in the third principal energy level? s and p only p and d only s, p, and d only s, p, d, and f
S, p, and d only
Bohr's model could only explain the spectra of which type of atoms? bonded atoms with more than one electron single atoms with one electron bonded atoms with one electron single atoms with more than one electron
Single atoms with one electron
Bohr's model could only explain the spectra of which type of atoms? bonded atoms with one electron bonded atoms with more than one electron single atoms with one electron single atoms with more than one electron
Single atoms with one electron
separation of light into different wavelengths
Spectrum
In Bohr's model of the atom, where are the electrons and protons located? The electrons move around the protons, which are at the center of the atom. The electrons and protons move throughout the atom. The electrons and protons are located throughout the atom, but they are not free to move. The electrons occupy fixed positions around the protons, which are at the center of the atom.
The electrons move around the protons, which are at the center of the atom.
How does the speed of visible light compare with the speed of gamma rays, when both speeds are measured in a vacuum? The speed of gamma rays is greater. The speed of visible light is greater. The speeds are the same. No answer can be determined from the information given.
The speeds are the same
How does the speed of visible light compare with the speed of gamma rays, when both speeds are measured in a vacuum? The speeds are the same. The speed of visible light is greater. The speed of gamma rays is greater. No answer can be determined from the information given.
The speeds are the same.
Which type of electromagnetic radiation includes the wavelength 10mc027-1.jpg m? microwave radio wave gamma ray visible light
Visible light
distance between wave crests
Wavelength
How can the position of a very tiny particle be determined? by measuring its velocity by measuring its mass by determining its charge by analyzing its interactions with another particle
by analyzing its interactions with another particle
Emission of light from an atom occurs when an electron falls into the nucleus. jumps from a lower to a higher energy level. moves within its atomic orbital. drops from a higher to a lower energy level.
drops from a higher to a lower energy level.
The quantum mechanical model of the atom defines the exact path of an electron around the nucleus. no longer requires the concept of energy levels. involves the probability of finding an electron in a certain position. was proposed by Niels Bohr
involves the probability of finding an electron in a certain position.
discrete bundle of electromagnetic energy
photon
According to the Heisenberg uncertainty principle, if the position of a tiny moving particle is known, the spin of the particle cannot be exactly determined. velocity of the particle cannot be exactly determined. mass of the particle cannot be exactly determined. charge of the particle cannot be exactly determined.
velocity of the particle cannot be exactly determined.
